Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b998b97e4145b3…

MALICIOUS

PDF

111.8 KB Created: 2020-08-01 17:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d12562d0bb67fdab37df0b888bec5a SHA-1: 6aea36561a532b5c866aacfa5d05b33610027c29 SHA-256: d9b998b97e4145b35c09360bab7f4f69245cf7abf26992ef3605ea677954541e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.cc/pify?keyword=1981+chevy+c10', which is flagged as a malicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=1981+chevy+c10
    • http://files.shamblinstone.com/uploads/1/3/1/3/131381976/50002.pdf
    • http://files.mykitchenkitchen.com/uploads/1/3/0/8/130874305/1110248.pdf
    • http://files.rydalmerefc.com/uploads/1/3/0/8/130874354/3048950.pdf
    • http://files.afpneia.org/uploads/1/3/1/8/131857049/dajofonu_diworamuvi_pefijejujora_gadebofobakegok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/52041195213.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/rifapubarelajavarasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/lanisuxoruzen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/rifimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/59716558595.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/80679809457.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/mugebaronidaduliweromiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/zawumidojipirokabolara.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/fusekafoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/65804160866.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/18559379017.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/tigovoxilejagesutojixa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015752.bin
7912978d6fdfc2a2059ad25b4bd23a99fb51d395397ec43e5d0c74c49b6604c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15752 4980 bytes
font_01_sfnt_off0001685c.bin
97e2ad19d592ff7cfe7612873a20008c83a83153f22664db00448194fed959ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1685C 16484 bytes
font_02_sfnt_off00019b21.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B21 16060 bytes

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